<pre>  /**
   * The constants used in this Content Widget.
   */
  public static interface CwConstants extends Constants {
    String cwConstantsWithLookupExampleDescription();

    String cwConstantsWithLookupExampleLinkText();

    String cwConstantsWithLookupExampleMethodName();

    String cwConstantsWithLookupExampleName();

    String cwConstantsWithLookupExampleNoInput();

    String cwConstantsWithLookupExampleNoMatches();

    String cwConstantsWithLookupExampleResults();
  }

  /**
   * A {@link TextBox} where the user can select a color to lookup.
   */
  private TextBox colorBox = null;

  /**
   * A {@link TextBox} where the results of the lookup are displayed.
   */
  private TextBox colorResultsBox = null;

  /**
   * An instance of the constants.
   */
  private final CwConstants constants;

  /**
   * Initialize this example.
   */
  @Override
  public Widget onInitialize() {
    // Create the internationalized constants
    colorConstants = GWT.create(ColorConstants.class);

    // Use a FlexTable to layout the content
    FlexTable layout = new FlexTable();
    FlexCellFormatter formatter = layout.getFlexCellFormatter();
    layout.setCellSpacing(5);

    // Add a link to the source code of the Interface
    final String rawFile = getSimpleName(ColorConstants.class);
    Anchor link = new Anchor(rawFile);
    link.addClickHandler(new ClickHandler() {
      public void onClick(ClickEvent event) {
        fireRawSourceRequest(rawFile + ".java");
      }
    });
    HorizontalPanel linkPanel = new HorizontalPanel();
    linkPanel.setSpacing(3);
    linkPanel.add(new HTML(constants.cwConstantsWithLookupExampleLinkText()));
    linkPanel.add(link);
    layout.setWidget(0, 0, linkPanel);
    formatter.setColSpan(0, 0, 2);

    // Add a field so the user can type a color
    colorBox = new TextBox();
    colorBox.setText("red");
    colorBox.setWidth("17em");
    layout.setHTML(1, 0, constants.cwConstantsWithLookupExampleMethodName());
    layout.setWidget(1, 1, colorBox);

    // Show the last name
    colorResultsBox = new TextBox();
    colorResultsBox.setEnabled(false);
    colorResultsBox.setWidth("17em");
    layout.setHTML(2, 0, constants.cwConstantsWithLookupExampleResults());
    layout.setWidget(2, 1, colorResultsBox);

    // Add a handler to update the color as the user types a lookup value
    colorBox.addKeyUpHandler(new KeyUpHandler() {
      public void onKeyUp(KeyUpEvent event) {
        updateColor();
      }
    });

    // Return the layout Widget
    updateColor();
    return layout;
  }

  /**
   * Lookup the color based on the value the user entered.
   */
  private void updateColor() {
    String key = colorBox.getText().trim();
    if (key.equals("")) {
      colorResultsBox.setText(constants.cwConstantsWithLookupExampleNoInput());
    } else {
      try {
        String color = colorConstants.getString(key);
        colorResultsBox.setText(color);
      } catch (MissingResourceException e) {
        colorResultsBox.setText(
            constants.cwConstantsWithLookupExampleNoMatches());
      }
    }
  }

</pre>